n. 25B6; noun
a signal to stop : GESTURE, sign, wave, gesticulation, cue, indication, warning, motion.
a clear signal that the company is in trouble : INDICATION, sign, symptom, hint, pointer, intimation, clue, demonstration, evidence, proof.
the encroaching dark is a signal for people to emerge : CUE, prompt, impetus, stimulus; informal go-ahead.
25B6; verb
the driver signalled to her to cross : GESTURE, sign, give a sign to, direct, motion; wave, beckon, nod.
they signalled displeasure by refusing to cooperate : INDICATE, show, express, communicate, proclaim, declare.
his death signals the end of an era : MARK, signify, mean, be a sign of, be evidence of, herald; poetic/literary betoken, foretoken.